How to create an ArrayList from an Array in PowerShell

Question

I ve got a list of files in an array  I want to enumerate those files  and remove specific files from it  Obviously I can t remove items from an array  so I want to use an ArrayList  But the following doesn t work for me    temp   Get-ResourceFiles  resourceFiles   New-Object System Collections ArrayList  temp    Where  temp is an Array   How can I achieve that

User · Answer

Probably the shortest version    System Collections ArrayList  someArray   It is also faster because it does not call relatively expensive New-Object

User · Answer

I can t get that constructor to work either  This however seems to work      temp   Get-ResourceFiles  resourceFiles   New-Object System Collections ArrayList  null   resourceFiles AddRange  temp    You can also pass an integer in the constructor to set an initial capacity   What do you mean when you say you want to enumerate the files  Why can t you just filter the wanted values into a fresh array   Edit   It seems that you can use the array constructor like this    resourceFiles   New-Object System Collections ArrayList   someArray    Note the comma  I believe what is happening is that when you call a  NET method  you always pass parameters as an array  PowerShell unpacks that array and passes it to the method as separate parameters  In this case  we don t want PowerShell to unpack the array  we want to pass the array as a single unit  Now  the comma operator creates arrays  So PowerShell unpacks the array  then we create the array again with the comma operator  I think that is what is going on

[powershell] How to create an ArrayList from an Array in PowerShell?

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